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This CL records the following histograms:
* Signin.SigninCompletedAccessPoint.WithDefault
* Signin.SigninCompletedAccessPoint.NotDefault
* Signin.SigninCompletedAccessPoint.NewAccount

Bug: 832066
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I42ecf6be254dcf51133d565e90df56ae1f69ef93
Reviewed-on: https://chromium-review.googlesource.com/1010362
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550615}